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Activity for Residential First-Lien Mortgage Servicing Rights (Detail) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2014 | Jun. 30, 2013 | Jun. 30, 2014 | Jun. 30, 2013
Servicing Assets at Fair Value [Line Items] |  |  |  |  |  |  |  |
Balance at beginning of period |  |  |  |  | $ 64,824 |  |  |
Additions |  |  |  |  | 11,976 |  | 28,614 |
Balance at End of Period | 71,225 |  |  |  | 71,225 |  |  |
Mortgage Servicing Rights |  |  |  |  |  |  |  |
Servicing Assets at Fair Value [Line Items] |  |  |  |  |  |  |  |
Balance at beginning of period | 64,971 |  | 18,123 |  | 64,824 |  | 5,315 |
Additions | 11,807 |  | 16,148 |  | 14,666 |  | 28,614 |
Changes in assumptions | (3,553) | [1] | 9,506 | [1] | (4,678) | [1] | 10,312 | [1]
Other changes | (2,000) | [2] | (679) | [2] | (3,587) | [2] | (1,143) | [2]
Balance at End of Period | $ 71,225 |  | $ 43,098 |  | $ 71,225 |  | $ 43,098 |
[1] | Primarily reflects changes in prepayment assumptions due to changes in interest rates and discount rates.
[2] | Represents changes due to realization of expected cash flows.

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- Definition The net increase or decrease in fair value as a result of changes in the assumptions or model used to calculate the fair value of servicing assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 50 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=7882072&loc=d3e122625-111746 + Details
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- Definition The value of new servicing assets, subsequently measured at fair value, acquired or created during the current period through purchases or from transfers of financial assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 50 -Section 50 -Paragraph 3 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=7882072&loc=d3e122625-111746 + Details
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- Definition Fair value of an asset representing net future revenue from contractually specified servicing fees, late charges, and other ancillary revenues, in excess of future costs related to servicing arrangements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 50 -Section 50 -Paragraph 3 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=7882072&loc=d3e122625-111746 + Details
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- Definition The net Increase or Decrease in fair value as a result of other changes that are not additions, disposals, or a result of change in the inputs, assumptions, or model used to calculate the fair value of servicing assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 50 -Section 50 -Paragraph 3 -Subparagraph (a)(4)(ii) -URI http://asc.fasb.org/extlink&oid=7882072&loc=d3e122625-111746 + Details
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